在使用图表呈现分析结果时，若要描述某高中学校5年来的高考录取率变化趋势，最好使用（）。
A、柱形图
B、饼图
C、条形图
D、折线图
参考答案：D
Which of the following statements about unemployment is least accurate（）
A. Frictional unemployment is unemployment due to changes in the economy that prevent qualified workers from being immediately matched with existing job openings.
B. The economy is said to be operating at full employment only if there is no cyclical or frictional unemployment in the economy.
C. The economy is said to be operating at full employment when cyclical unemployment is zero.
同型血之间的输血不需要做交叉配血实验。（）
